Emery, 1921c: 66; Smith, 1951c: 798; Kempf, 1972b: 166; Smith, 1979: 1360.
Emery, 1921c: 66 (diagnosis); Wheeler & Creighton, 1934: 348 (species key); Creighton, 1950a: 155 (species key); Demarco & Cognato, 2015: 1 (phylogeny), 7 (diagnosis); Cantone, 2017: 220 (brief male diagnosis).
Extant: 3 valid species (2 synonyms), 0 valid subspecies (1 synonym)